BRK, 10 Year Sealed Battery Ionization Smoke Alarm, Includes An Easy Twist Mount Matching Hardware, Increasingly Loud 85 Decibel Sound Output A Powerful LED Indicator Add Tremendous Versatility To An Already Flexible Alarm Unit, An End Of Life Warning Has Been Included Will Actively Alert You Your Surroundings Whenever The Alarm Is In Need Of A Replacement, Swift Near Effortless Installation Process, Meeting UL217 Standards, , NOTE Please Check Your Local Building Code Requirements Before Installing This Product To Determine Compliance With Applicable Standards